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fix: keep credit-pool history through pruning - #7845
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WalkthroughThe changes retain block bodies needed to rebuild credit-pool state, using persisted snapshots to calculate a pruning boundary. Before pruning block files, the node synchronizes committed EvoDB records. If required local history is missing, block processing aborts with reindex guidance instead of marking the block invalid. Tests cover pruning boundaries, missing-history handling, restarts, and tip rollback. Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant FlushStateToDisk
participant GetCreditPoolPruneLockHeight
participant CCreditPoolManager
participant CEvoDB
participant BlockFiles
FlushStateToDisk->>GetCreditPoolPruneLockHeight: calculate chainstate prune boundary
GetCreditPoolPruneLockHeight->>CCreditPoolManager: get snapshot-based lock height
GetCreditPoolPruneLockHeight-->>FlushStateToDisk: return minimum lock height
FlushStateToDisk->>CEvoDB: sync committed records
FlushStateToDisk->>BlockFiles: prune files after successful sync
Merge Risk: ⚪ Minimal · up to Pruning now keeps the block history needed to rebuild the credit pool. If that history is already missing, the node stops with a reindex hint instead of marking a valid block invalid. The release notes accurately describe the retention behavior, and no merge-blocking risk remains. Pre-merge checks |
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 10.26% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 39 functions across 13 files. (1 skipped:… | Write docstrings for the functions missing them to satisfy the coverage threshold. |
✅ Passed checks (4 passed)
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Check name Status Explanation Description check The description clearly explains the pruning, credit-pool history, local error handling, testing, and recovery changes in the pull request. Title check The title concisely and accurately summarizes the primary change: preserving credit-pool history during pruning. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
Full details: Docstring Coverage
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Explanation
Docstring coverage is 10.26% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 39 functions across 13 files. (1 skipped: 1 unsupported.)
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✅ Final review complete — no blockers (commit db6bac6) · triage: normal |
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Final validation — Phase 1 + Phase 2
Static verification at head dc7b568 supports the supplied reviewers’ clean findings: committed-snapshot retention, EvoDB synchronization before unlinking, and local-error propagation are consistent with the reconstruction and validation paths. No concrete in-scope correctness or consensus defect was identified. No builds or tests were run in this lane; the supplied CI snapshot shows container builds queued and PR-title validation failing because evo is not an allowed scope, so this approval does not establish CI or merge readiness.
Review provenance
Source: reviewer 1: muse-spark-1.3-contributor (agent: phase1-reviewer, role: general); reviewer 2: gpt-6.1-sol (agent: phase2-reviewer, role: general); reviewer 3: gpt-6.1-sol (agent: phase2-reviewer, role: dash-core-commit-history); final verifier: gpt-6.1-sol (agent: sol-verifier, role: final-verifier)
- Triage:
normalbygpt-6.1-sol(effort low) — The changes intricately coordinate credit-pool history retention, EvoDB durability and validation error classification across several files, but do not change consensus rules, funds movement, cryptography, peer-facing deserialization or storage migrations. - Phase 1 reviewers:
muse-spark-1.3-contributor— general (completed, effort xhigh); agentphase1-reviewer - Phase 1 model:
muse-spark-1.3-contributor— not quota-gated; passed overgemini-3.8-flash-high(antigravity below 15% reserve: weekly 15% left, 5h 100% left),glm-5.3-flash(not used above high effort; tier asks max) - Fresh verifier:
gpt-6.1-sol— final-verifier; agentsol-verifier - Phase 2 reviewers:
gpt-6.1-sol— general (completed, effort high); agentphase2-reviewer,gpt-6.1-sol— dash-core-commit-history (completed, effort high); agentphase2-reviewer
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @doc/release-notes-7845.md:
- Around line 5-8: Update the release-note description of the prune lock to
explain that it selects a persisted snapshot at or before the reorg and recovery
boundary, rather than always using the most recent persisted snapshot. Correct
the retention estimate to account for required history such as height 477 after
the height-1152 snapshot exists, and state that the lock can advance as the tip
passes the boundary without another flush.
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⚙️ Run configuration
- Configuration used: Repository UI
- Review profile: CHILL
- Plan: Advanced
- Run ID:
46327b0d-c44d-4870-8bc4-bd98c548f08f
📒 Files selected for processing (14)
doc/release-notes-7845.mdsrc/evo/creditpool.cppsrc/evo/creditpool.hsrc/evo/evodb.cppsrc/evo/evodb.hsrc/evo/specialtxman.cppsrc/test/evo_assetlocks_tests.cppsrc/validation.cpptest/functional/feature_creditpool_pruning.pytest/functional/feature_remove_pruned_files_on_startup.pytest/functional/interface_usdt_utxocache.pytest/functional/rpc_getblockfrompeer.pytest/functional/rpc_rawtransaction.pytest/functional/test_runner.py
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Re-review — Final validation — Phase 2 only (queue backlog)
Verified the complete diff at f5935be and the surrounding reconstruction, pruning, persistence, and validation paths; no blocking correctness issue was identified. One non-blocking coverage gap remains for recovery from an on-disk coins tip whose fork precedes the ordinary reorg boundary. This was a static review: the supplied CI snapshot shows successful formatting and preliminary checks, but build/container jobs were queued and do not establish build or test success.
🟡 1 suggestion(s)
Review provenance
Source: reviewer 1: gpt-6.1-sol (agent: phase2-reviewer, role: general); reviewer 2: gpt-6.1-sol (agent: phase2-reviewer, role: dash-core-commit-history); reviewer 3: gpt-6.1-sol (agent: phase2-reviewer, role: general); reviewer 4: gpt-6.1-sol (agent: phase2-reviewer, role: dash-core-commit-history); final verifier: gpt-6.1-sol (agent: sol-verifier, role: final-verifier)
- Triage:
normalbygpt-6.1-sol(effort low) — The change spans credit-pool history retention, pruning durability, and local-error classification, but does not change consensus rules, funds movement, cryptography, network deserialization, or storage migrations. - Phase 1 reviewers: not run (skipped for throughput: 16 PRs queued, above the 10 limit)
- Fresh final gate: an independent Phase-2 review ran after iterative findings were reconciled
- Fresh verifier:
gpt-6.1-sol— final-verifier; agentsol-verifier - Phase 2 reviewers:
gpt-6.1-sol— general (completed, effort high); agentphase2-reviewer,gpt-6.1-sol— dash-core-commit-history (completed, effort high); agentphase2-reviewer,gpt-6.1-sol— general (completed, effort high); agentphase2-reviewer,gpt-6.1-sol— dash-core-commit-history (completed, effort high); agentphase2-reviewer
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These findings are from an automated code review. Verify each finding against the current code and only fix it if needed.
In `src/validation.cpp`:
- [SUGGESTION] src/validation.cpp:2989-2992: Exercise the recovery anchor when it precedes the reorg floor
The functional test covers committed-snapshot advancement and a short rollback, but does not exercise a recovery anchor below the ordinary 288-block reorg floor. The committed-snapshot unit test calls CCreditPoolManager directly, bypassing this boundary selection. This leaves the distinct restart-recovery protection without regression coverage: ReplayBlocks rolls forward from the disk/live fork and may need history older than the snapshot selected by reorg_floor alone. Add a scenario where that fork lies below reorg_floor and the two boundaries select different committed snapshots, then verify that pruning retains the older required body and reconstruction or restart replay succeeds. The PR already documents this limitation; it is a coverage suggestion, not an identified defect in the implementation.
| const int recovery_height{disk_tip ? LastCommonAncestor(live_tip, disk_tip)->nHeight : 0}; | ||
| const int reorg_floor{std::max(0, live_tip->nHeight - static_cast<int>(MIN_BLOCKS_TO_KEEP))}; | ||
| const int parent_height{std::min(reorg_floor, recovery_height)}; | ||
| height_first = std::min(height_first, cpoolman.GetPruneLockHeight(*live_tip->GetAncestor(parent_height))); |
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⏭️ Deferred (maintainer decision; not blocking) at
f5935be7; see the replies below.
🟡 Suggestion: Exercise the recovery anchor when it precedes the reorg floor
The functional test covers committed-snapshot advancement and a short rollback, but does not exercise a recovery anchor below the ordinary 288-block reorg floor. The committed-snapshot unit test calls CCreditPoolManager directly, bypassing this boundary selection. This leaves the distinct restart-recovery protection without regression coverage: ReplayBlocks rolls forward from the disk/live fork and may need history older than the snapshot selected by reorg_floor alone. Add a scenario where that fork lies below reorg_floor and the two boundaries select different committed snapshots, then verify that pruning retains the older required body and reconstruction or restart replay succeeds. The PR already documents this limitation; it is a coverage suggestion, not an identified defect in the implementation.
source: gpt-6.1-sol (phase2-reviewer: general)
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Declining for this PR. As the comment notes, this is coverage for a documented boundary rather than a defect, and building a scenario where the disk/live fork lies below the reorg floor would need a forced unclean shutdown plus a long chain, adding a slow, fragile functional test for a path whose selection logic is a single std::min over the two boundaries in validation.cpp. Keeping the PR's test footprint to the pruning regression it fixes.
🤖 Posted autonomously by Claude on behalf of pasta.
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I accept keeping the test footprint focused on the pruning regression; after checking the boundary selection and replay path, I’m comfortable leaving this documented coverage gap deferred rather than requiring a crash-recovery scenario in this PR.
Noted as intentionally deferred; I will not press it further here.
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Re-review after discussion — commit f5935be
Standing review was COMMENTED; this re-review is APPROVE: no blocking findings remain.
Approved: the discussion withdrew or deferred every finding the full review of f5935be7 (run 3933) raised, and the approval rests on that review.
Same commit as the standing review; the inline threads above carry the per-finding outcome. This follow-up exists only to correct the verdict.
Review provenance
Source: conversation lane gpt-6.1-sol (agent: conversation); no reviewer or verifier lanes ran for this follow-up
- Verdict moved because the inline discussion withdrew or deferred findings of the standing review of this commit; the code was not re-reviewed
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concept NACK
Dash Core should kept at least one [or 2?] days of blocks before pruning happends. It will improve user's experience and it will fix corner-case scenario that this PR is aiming to fix.
So, dash core should enforce keeping at least 576+1 block or maybe 576 * 2.
So, I think 7845 should be replaced by increasing limit.
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This pull request has conflicts, please rebase. |
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consider merging this one instead: #7861 |
Rebuilding a credit pool after a restart reads blocks back to one withdrawal window before the latest disk snapshot, which can be far older than the 288 blocks pruning keeps. Once those bodies were pruned, the failed read was reported as a consensus failure and a canonical block was permanently marked invalid. Protect the history that reconstruction needs with a prune lock. The lock is recomputed before every pruning decision from snapshots that are already committed to disk, for the oldest parent any chainstate may still need after a reorg or a restart. The EvoDB is synced before pruned files are unlinked. A block body that is unavailable locally now stops the node with a -reindex hint instead of invalidating the block. Pruning tests that prune early regtest blocks postpone V20, as the other pruning tests already do. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Re-review — Final validation — Phase 1 + Phase 2
Independently reviewed the complete diff at db6bac6 and found no actionable in-scope defects. The prune lock selects committed snapshots conservatively across reorg and recovery boundaries, EvoDB synchronization precedes file unlinking, and unavailable local history returns an error without marking the candidate block invalid. This was static verification only: the supplied CI snapshot shows successful lint and eight source-build jobs, with two builds and four source-test jobs still pending.
🔴 0 blocking | 🟡 0 suggestion(s) | 💬 0 nitpick(s)
Review provenance
Source: reviewer 1: muse-spark-1.3-contributor (agent: phase1-reviewer, role: general); reviewer 2: gpt-6.1-sol (agent: phase2-reviewer, role: general); reviewer 3: gpt-6.1-sol (agent: phase2-reviewer, role: dash-core-commit-history); reviewer 4: gpt-6.1-sol (agent: phase2-reviewer, role: general); reviewer 5: gpt-6.1-sol (agent: phase2-reviewer, role: dash-core-commit-history); final verifier: gpt-6.1-sol (agent: sol-verifier, role: final-verifier)
- Triage:
normalbygpt-6.1-sol(effort low) — The change involves intricate pruning retention, snapshot durability, and local-error classification, but does not alter consensus rules, funds movement, cryptography, network deserialization, or storage migrations. - Phase 1 reviewers:
muse-spark-1.3-contributor— general (completed, effort xhigh); agentphase1-reviewer - Phase 1 model:
muse-spark-1.3-contributor— not quota-gated; passed overgemini-3.8-flash-high(antigravity below 15% reserve: weekly 14% left, 5h 100% left),glm-5.3-flash(not used above high effort; tier asks max) - Fresh final gate: an independent Phase-2 review ran after iterative findings were reconciled
- Fresh verifier:
gpt-6.1-sol— final-verifier; agentsol-verifier - Phase 2 reviewers:
gpt-6.1-sol— general (completed, effort high); agentphase2-reviewer,gpt-6.1-sol— dash-core-commit-history (completed, effort high); agentphase2-reviewer,gpt-6.1-sol— general (completed, effort high); agentphase2-reviewer,gpt-6.1-sol— dash-core-commit-history (completed, effort high); agentphase2-reviewer
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These findings are from an automated code review. Verify the current code and confirm that no unresolved issues remain.
No unresolved findings remain from the prior review on this head.
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This pull request has conflicts, please rebase. |
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Closing as superseded by #7861. Develop now keeps at least 2304 blocks ( #7861 leaves one part of this PR unaddressed. When a historical block read fails during credit-pool reconstruction, 🤖 Posted autonomously by Claude on behalf of pasta. |
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Issue being fixed or feature implemented
A pruned node can permanently reject a canonical block after a restart. To rebuild a credit pool, the node starts at the latest credit-pool disk snapshot (one every 576 blocks). For each block after it, it reads that block and the block one withdrawal window (
CreditPoolPeriodBlocks, 576 on mainnet/testnet) earlier. The oldest block needed can be about two windows below the tip, but pruning only guarantees 288 blocks. Nothing protected those blocks from pruning.Once they are pruned and the in-memory caches are cold, the failed read throws a plain
std::runtime_error. BothProcessSpecialTxsInBlock()andGetCreditPoolDiffForBlock()report that asBLOCK_CONSENSUS.ConnectTip()then persistsBLOCK_FAILED_VALIDon the next canonical block, and the node stops following the chain until manual recovery.This affects ordinary pruned nodes (masternodes cannot prune) with V20 active, once automatic or manual pruning removes the needed history. It is a local chain-following failure. No network split or acceptance of an invalid block is involved.
What was done?
Keep the history reconstruction needs. A
creditpoolprune lock is recomputed before every pruning decision: automatic, manual, at startup and after disconnects.snapshot + 1 - window. With no committed snapshot it keeps blocks fromV20 - window. Either way it never goes below DIP0003, before which no block is read.Make the snapshots durable first. The EvoDB is synced before pruned files are marked and unlinked, so the snapshots the lock relied on are on disk.
Treat a missing local block as a local error. A failed historical block read now throws a typed
CreditPoolBlockReadError. Both validation entry points catch it before their generic handlers, callAbortNodewith a-reindexhint and returnstate.Error(). The block is no longer marked invalid. Real transaction, index and coinbase-balance violations keep their consensus rejection.Postpone V20 in tests that prune early regtest blocks.
rpc_rawtransaction.py,rpc_getblockfrompeer.py,feature_remove_pruned_files_on_startup.pyandinterface_usdt_utxocache.pyprune blocks below the first usable snapshot. They now postpone V20, asfeature_pruning.py,wallet_pruning.pyandfeature_index_prune.pyalready do.Release notes.
doc/release-notes-7845.mddescribes the larger retention, the flush lag, the pause in pruning for nodes upgrading from before v24.0.0-rc.1, and the new-reindexstop.The credit-pool values are unchanged, and so is which blocks are accepted, so there is no deployment gate. A node that has all the block history computes and validates exactly as before.
How Has This Been Tested?
macOS arm64 with depends; all builds were
make -j1.evo_assetlocks_tests/missing_credit_pool_history_is_local_errorcreates a header without its body and runs both validation entry points on top of it.IsInvalid()rather thanIsError().EXIT_FAILURE. Invalid credit-pool transactions and an invalid coinbase payload are still rejected as consensus violations.credit_pool_prune_lock_waits_for_committed_snapshotshows that a snapshot still pending in the EvoDB overlay does not move the prune lock, and that it moves once the snapshot is committed.evo_assetlocks_testscases pass.validation_flush_tests,validation_chainstate_tests,validation_chainstatemanager_testsandblockmanager_testspass.feature_creditpool_pruning.py. It runs a second regtest node next to an unpruned one. That node syncs unpruned first, then restarts pruned (-fastprune, manual pruning). Starting it with-prune=1on an empty chain would hit a pre-existing UBSan unsigned overflow in the first-startup disk-space check ininit.cpp, which madelinux64_asan-testfail.creditpoollock at height 466: block 1 is pruned and block 477 is kept. The next block from the unpruned node connects, andgetcreditpoolinfomatches.reconsiderblockthen resyncs and the credit pools still match.feature_index_prune.py,rpc_rawtransaction.py,rpc_getblockfrompeer.pyandfeature_remove_pruned_files_on_startup.pypass. Without the V20 postponement, the last three failed with this change.lint-python, circular-dependencies, includes and file-permission lints are clean, as are changed-lineclang-formatandgit diff --check.Not tested:
interface_usdt_utxocache.pyneeds Linux BPF and was not run; its edit is arguments only.feature_pruning.py(extended) was not run. It already postpones V20 to 2000, and its chain stays below the height where the lock engages.-reindex. With this change the node stops cleanly instead of marking a valid block invalid.Breaking Changes
None to consensus or RPC.
Pruned nodes with V20 active keep more history: roughly two credit-pool windows plus 288 blocks, which is small compared with the 550 MiB minimum target.
The lock only advances after a full flush. Until one happens, retention can trail by up to about a day's worth of blocks. This only affects how much is pruned, not whether the required history is kept.
A pruned node that has already lost the history it needs now stops with a
-reindexmessage instead of marking a valid block invalid.Checklist:
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